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Is the order of drawing triangles in a 3D API guaranteed to be the same as their order in the index buffer?
For example if I have two overlapping triangles in a single draw call, and depth testing is disabled, will the first or second triangle be visible in the end?
Or do I need to issue separate draw calls to be sure that the 2nd triangle appears on top of the 1st?
In OpenGL the order is indeed preserveed, so that painters algorithm can be used, for example when rendering semitransparent geometry.
Direct3D I don’t know for sure, but I’d say the same applies there.